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  Produced first compound microscope by combining two complex lenses with a tube. Allowed people to observe cells.
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  Belived in spontanegous generation. Believed if you put a rag over a pot of rice for 21 days you would create mice.
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  He discovered and named cells.
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  Discovered the nucleus in plant cells.
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  First to observe and describe single celled organisms referred to as " animalcules".
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  Aristotle observed preformation and epigenisis when theorizing how animals and plants developed. Preformation is the theory that a sperm or other cell is a miniature version of the animal and will grow when properly stimulated. Epigenisis is the theory that animals develope from similar parts or other animals.
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  Created new classifications for animals based on their evolutionary path. Shows similarities between organisms cells fundamental unit of life.
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  He discovered that all plants are made of cells.
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  He discovered all animals are made of cells.
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  He claimed research on the nervous system. Connection between nerve fibers and cell bodies are all attached.
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  Discovered new cells could be produced only by division of existing cells. Also that living things can only come from other living things. Nonliving things cant make living things
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  Ended debate with swan-neck flask experiment and is the reason that Paturization was made and is still used today.